Mahaska County seems like a peaceful, quiet place. "This is rural Iowa," Michael Berrier, an officer with the Iowa Division of Criminal Investigation, told "Killer Siblings," airing Fridays at 8/7c on ...

Police Lt. Peter Merylo, who worked on the case for 6 years, characterized the killer as coldly efficient and as relentless as an executioner when in the mood to kill. Although Frank Dolezal confessed ...